Shaft-oscillator.



NTTED sTATEs PATENT oEEroE.

WILL F. BOUCHE, OF NORWOOD, OHIO, ASSIGNOR TO ALLIS-CHALMERS COMPANY, ACORPO- RATION OF NEW JERSEY, AND THE BULLOCK ELECTRIC MANUFACTURINGCOMPANY, A

CORPORATION OF OHIO.

SHAFT-OSCILLATOR.

Specification of Letters Patent.

Patented Dec. 3, 1907.

Application filed August 31.1906. Serial No. 332,745.

ing or reciprocating shafts longitudinally in their bearingsparticularly shafts of dynamoelectric machines.

An oscillating movement given to a rotating element of a dynamo-electricmachine, especially a rotary converter, causes the shaft of said elementto operate in its bearings and prevents the wearing of the ridges andgrooves in the -commutator of the ma.

chine. Many'mechanical and magnetic devices have been constructed forthis purpose but none have proven entirely satisfactory.

The object of my invention is to produce the desired result by means ofmechanical oscillator, which is positively driven from a shaft so thatthere can be no slip between the shaft and the oscillator.

In carrying out my invention I drive a rotary spindle from the shaft,which spindle opcrates an oscillatory member which moves the shaftlongitudinally in its bearings.

Considering my invention more specifically I mount on the end of theshaft or upon an extension thereof, a worm wheel in such a manner thatthe wheel rotates with the shaft, but so that the shaft can move inalongitudinal directionrelative to the wheel. On the end of the bearinghousing I provide a frame which has a downwardly extending arm whichengages the gear wheel so as to prel vent a longitudinal movement withthe shaft. yMounted in the lower part of the frame preferably at rightangles to the shaft is a spindle carrying a worm gear wheel which mesheswith the worm on the shaft or shaft extension, and also carries a camshaped member. Pivoted at the upper part of the frame is an arm, thelower end of which extends downward into engagement with the cams sothat when the latter is rotated with the spindle the arm isgiven anoscillatory movement. The arm is providedwith anti-friction rollerbearings which bears on the end of the shaft or extension thereof sothat the oscillatory movement of the arm is transmitted to the shaft.Since there is a positive driving connection between the shaft and thespindle which furnishes the oscillatory movement to the pivoted arm,there can be no slip between the oscillator and the shaft asis the casewhen frictional drives are employed.

My invention consists in the details of construction and the combinationand arrangements of parts described in the speciiication and set forthin the appended claims.

For a better understanding of my invention reference is had to theaccompanying drawing in which Figure 1 is a section of a portion of ashaft and bearing having my improved shaft oscillator applied thereto,and Fig. 2 is an end view of the same.

Referring now to the figures of the drawing in which I have shown thebest form of my invention now known to me,` 10 represents a rotary shaftmounted in a bearing 11 incased in a bearing housing 12. The shaft isprovided at one end with an extension 13 which in this case is aseparate member secured by screws 14 to the end of the shaft. Ifdesired, however, the extension 13 which is preferably smaller indiameter than the shaft may be an integral part thereof. Secured to theend of the bearing housing by screws 15v is a frame 16 which sup ortsparts of the shaft oscillator. Mounted) on the shaft extension 13 is aworm 17. The worm 17 engages extension only by a feather 18 so that theworm rotates with the shaft but relative movement in an axial directionis permitted. The movement of the worm longitudinally of the shaft isprevented in this case by an arm 19 integral with the frame 16. The arm19 is provided with an opening in which the end of the shaft extension13 is located and is provided on each side of the shaft with a pair ofears or lugs 20 in which are mounted inwardly extending pins 21 whichengage a continuous groove 22 in one endv of the worm 17.

Supported on outwardly extending arms on the lower' part of the frame 16and at loosely the extension 13 being secured to the lwith the center ofthe shaft is an adjustable substantially right angles to the shaft, is aspindle 24, on which is mounted a worm gear 2.5 which meshes with theworm 17. Thus the rotarymovement of the wheel 17 is transmitted to thespindle 24 whi-ch rotates at a much lower speed than the shaft. Fixed tothe spindle at each side of the worm wheel 24 is a cam-shaped member 26provided on its periphery with a shoulder 27.

Pivoted between a pair of lugs 28 at the upper part of the frame 16 is aU-shaped oscillatory arm 29 which extends outward and downward over theshaft extension and is bifurcated at its lower free end, the two prongsof the end being located on opposite sides of the worm wheel 25 andextending downward into engagement with the peripheries of thecam-shaped members 26. Mounted in the oscillatory arm 29 in linescrew-threaded member 30' having an enlarged head 31 in which is securedby a removable plate 32 an anti-friction ball 33, which normally restson thel end of the shaft extension 13. Coiled about the hubs 34 of theoscillatory arm 29 is a spring 35 which presses the arm 29 downward withthe ball 33 in engagement with the shaft.

The operation of the device will now be explainedz-VVhen the shaft isrotated, rotary movement is transmitted to the spindle 24 and cams 26 bymeans of the worm and worm wheel. As the cam rotates slowly theoscillatory arm 29 is gradually moved to the left due to the graduallyincreasing radius of the cam-shaped member until the lower ends of j thearm 29 pass the shoulder 27. As the arm 19 is moved to the left theshaft is moved to the left against the normal bias of the machine. lThenormal bias in a dynamo-electric machine is produced by the action ofthe magnetic field in which the armature rotates. When the ends of thearm 29 pass the shoulder 27 the shaft is moved to the right by theaction of magnetic fields until the bifurcated end of the arm againengages the cam-shaped members 26. It is seen that the shaft isoscillated continuously the period of 'oscillation depending for eachparticular oscillator on the speed of rotation. lf it is desired to jadjust the period of oscillation all `that is necessary is to substitutefor the gear 17 and 26,

other gears having threads of a different pitch. lr it is desired toadjust the extent 'of oscillation, all that is necessary is to adjustthe position of the screw-threaded member 30, or to substitute anothercam having a greater eccentricity.

lt is evident that many changes can be made in the details withoutdeparting from the spirit and scope of my invention, and I aim in myclaims to cover all such changes.

What I claim as new and desire to secure by Letters Patent is 1. Incombination, a rotary shaft, a rotary spindle driven by said shaft, andoscillatory means operated by said spindle for moving the shaftlongitudinally in its bearings.

2. ln combination, a rotary shaft, a rotary spindle driven by the shaft,an arm pivoted to a stationary support and bearing on the end of theshaft, and means for reciprocating the arm from said spindle.

3. In combination, a rotary shaft, a toothed wheel positively driventhereby, and means operated by said wheel for oscillating said shaft.

4. In combination, a rotating shaft, a gear wheel rotating therewith, asecond gear wheel meshing with the Erst gear wheel,` and means operatedby said second gear wheel for moving said shaft longitudinally in itsbearings.

5. In combination, arotary shaft, a spindle at substantially rightangles to the shaft, a driving connection between the shaft andspindle,l andan arm pivoted to a stationary support and reciprocated bysaid spindle, said arm bearing on the shaft.

6. In combination, a rotary shaft, a spin-A dle driven by said shaft, acam carried by said spindle, and a pivoted member reciprocated by thecam and bearing yon the shaft.

7. In combination, a rotary shaft, a spindie at substantially rightangles thereto, a gear wheel connection between the shaft and spindle,and a pivoted arm reciprocated by the spindle longitudinally of theshaft so as to oscillate the latter.v

8. In combination, a rotary shaft, a spindle, a gear wheel connectionbetween the shaft and spindle, a cam driven by the spindle, a pivotedarm reciprocated by the cam and bearing on the end of the shaft.

9. In combination, a rotary shaft, a rotary cam, a worm and worm wheelconnection between the cam andshaft, one of the worm wheel members beingmounted on the shaft so as to have a rotary movement only, a pivoted armreciprocated by the cam in the plane of the longitudinal axis of theshaft, and a member carried by the arm and bearing on the shaft.

10. In combination, a rotary shaft, a spindle, a cam-shaped memberthereon, a gear wheel connection between the shaft and spindle, one ofthe gear-wheels being mounted on the shaft so that the latter canmovelongitudinally thereof, a pivoted arm reciprocated by said cam, andanti-friction means carried by the arm for transmitting its movement tothe shaft.

1 1. In combination, a rotary shaft, a bearing and bearing-housing, aframe secured to the housing, a gear-wheel mounted on the shaft so thatthe shaft can have a longitudinal movement relative thereto, astationary arm on'the frame and engaging the gear- Wheel so as toprevent longitudinal movei ing carried by the pivoted arm and bearingment thereof, a spindle at substantially right on the end of the shaft.10 angles to the shaft, a Gam and gear Wheel oar- In testimony whereof Iaffix my signature, ried by the spindle, said last named gear in thepresence of tWo Witnesses. Wheel meshing With the gear Wheel on the WILLF. BOUCHE.` shaft, an arm pivoted to the frame and en- Witnesses:

gaging the @am so as to have a reoiprooatory RUBY ROBINSON,

movement7 and an anti-friction roller bear- FRED' J. KINSEY.

